refactor(internal/surfer): encapsulate provider logic into new package

[sarahheacock]

The core gcloud configuration, field, loader, method, resource, and service information logic has been extracted from the package into a new, dedicated package. This separates generic surfer API rules and configuration definitions from the gcloud-specific command and argument builder implementations.

provider should slowly decrease in size as sidekick improves and the gcloud config decreases in size. This abstracts away the current current sources of data so that they can be updated over time.

Fix: #4714

[codecov]

Codecov Report

❌ Patch coverage is 88.37209% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.39%. Comparing base (71f7d3b) to head (a19a604).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/surfer/gcloud/provider/config.go	75.00%	4 Missing and 2 partials ⚠️
internal/surfer/gcloud/provider/loader.go	0.00%	5 Missing ⚠️
internal/surfer/gcloud/generate.go	81.81%	2 Missing ⚠️
internal/surfer/gcloud/provider/method.go	92.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4724      +/-   ##
==========================================
+ Coverage   81.37%   81.39%   +0.01%     
==========================================
  Files         130      131       +1     
  Lines       10905    10946      +41     
==========================================
+ Hits         8874     8909      +35     
- Misses       1392     1397       +5     
- Partials      639      640       +1     

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[gemini-code-assist]

Code Review

This pull request successfully refactors the core logic for gcloud command generation into a new provider package. The changes correctly update import paths, function calls, and types to reflect the new package structure, enhancing modularity and encapsulation as described in the pull request description. All moved functions have been appropriately exported and integrated into the provider.Config struct where applicable. The corresponding test files have also been updated to reflect these changes, ensuring continued test coverage for the refactored logic.

[quirogas]

LGTM